Cashbuild to poorbuild with Duram non-sticky flashbands. TOTALLY DISAPPOINTING.

I am totally disappointed that a reputable store like Cashbuild would stock and sell flashband from Duram. I wanted to waterproof my house but this time decided to use flashband. I then bought 8 Duram flashbands from Cashbuild Highgate. A day after mounting them they are coming off instead of increased adhesion. Took all of my time to drive to Highgate, prepare the roof and mount the Duram flashbands for them to be coming off all on their own. When visiting Cashbuild you would think all the quality checks have been carried out on the items they sell. I don't expect to be doing endless home maintenance as this is a complete waste of time and money. I thought you fly proudly South African.